by Kastro
Paper/Archive/CVE-2026-43999

CVE-2026-43999

patriksimek vm2 — vm2: NodeVM builtin allowlist bypass via `module` builtin's `Module._load` allows sandbox escape

EPSS 1.0%public exploitCVSS 9.9
critical.is priorityof 100
52
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 62.1.621 × 2012.4Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, NodeVM's builtin allowlist can be bypassed when the module builtin is allowed (including via the '*' wildcard). The module builtin exposes Node's Module._load(), which loads any module by name directly in the host context, completely bypassing vm2's builtin restriction. This allows sandboxed code to load excluded builtins like child_process and achieve remote code execution. This vulnerability is fixed in 3.11.0.

Affected

ProductAffectedFixed inSource
vm2< 3.11.0–CNA
Red Hat Ansible Automation Platform 2.1see advisory1785854226redhat-SADP
Red Hat Developer Hubsee advisory–redhat-SADP

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
redhat-SADP (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8refaccess.redhat.com/security/cve/CVE-2026-43999refbugzilla.redhat.com/show_bug.cgi?id=2477196refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43999.jsonadvisoryaccess.redhat.com/errata/RHSA-2026:50850